Having a closer look, updating TeX Live is a bit like sending a letter in the old days. The letter needs some time until it is delivered. The servers that distribute TL to the world need some time till the letter is delivered. Wait till tomorrow and the installation should be as smooth as always.

The smart way: Calm down and take a deep breath, read posts and provided links attentively, try to understand and ask if necessary.

Having a closer look, updating TeX Live is a bit like sending a letter in the old days. The letter needs some time until it is delivered. The servers that distribute TL to the world need some time till the letter is delivered. Wait till tomorrow and the installation should be as smooth as always.

I checked your link Stefan, but I don't understand which file do I have to download to get TL 2017, because I always installed before using the huge ISO, but in this case, the last date I have found for TL 2017 was May 23th

Can you explain to me the meaning of the mirrors to install TL?Why can't I find a downloadable ISO with the most recent date?

When you download something from CTAN, an image or other files, whenever you update, CTAN automatically chooses a mirror for you. It may be based on geographic location, depending on your IP address, I think, to get the nearest mirror to you. So, for example, you would download from a south America mirror server, not from Europe or Asia what would be slower. And, the mirrors distribute the load on the CTAN server, so it doesn't break when thousands of users download gigs, install TeX Live, or update it. That's a great thing, such a grown infrastructure, seen that it's noncommercial. A monitoring page shows the network status.

You can ignore the mirror thing though. It's automatic. I just like to choose a mirror server manually and click my way through (root directory, systems, texlive).

The most recent image is of May 24, that's correct. The remaining days things were finally tested and no problem found that required re-building the image. So you can install it. Actually, texlive.iso is a link to the most recent texlive image so you don't need to check the date in the file name. Here you can see the links: